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Research Seminar - Mikael Jagan and Ivan Krylov

01/10/2025

We are pleased to announce the upcoming Research Seminar on October 1, 2025

The Institute for Statistics and Mathematics is pleased to invite you to this semester’s first research seminar, taking place on campus with the following two talks:

  • Mikael Jagan (Department of Mathematics & Statistics, McMaster University, Canada
    Midpoint-Radius Interval Arithmetic and R Package ‘flint’, an R Interface to the FLINT C Library

    Wednesday, October 1, 2025, 15:00 – approx. 16:00, Building D4, Room D4.0.133

    Abstract:
    Interval arithmetic enables computation with automatic propagation of input error.  Defining interval arithmetic in arbitrary but finite precision (hence over a set of floating-point real numbers) raises interesting questions about how to represent intervals in memory and how to implement mathematical functions in light of tradeoffs between optimality of output and efficiency.  In the first half, I survey some of these issues, maintaining a focus on midpoint-radius interval arithmetic, also known as ball arithmetic, and its implementation in the Arb module of the FLINT C library. In the second half, I introduce R package 'flint', an R interface to FLINT, covering design principles, scope, usage, and future development.

  • Ivan Krylov
    Tensor Decompositions of Fluorescence Spectra: A Case Study in R

    Wednesday, October 1, 2025, approx.16:00 – 17:00, Building D4, Room D4.0.133

    Abstract:
    Excitation-emission fluorescence spectroscopy is a cheap and sensitive analysis method, which ensures its wide popularity in environmental monitoring. The structure of the resulting data makes it very amenable to tensor decompositions, specifically, PARAFAC, but the process involves a lot of important details. We will explore some of them, including data pre-treatment (surface interpolation), model validation (split-half), implementation and packaging in R (and some auxiliary packages), and take a look at problems still in need of a satisfactory solution, such as regularisation and expansions of the model.


Please note that currently there are no Zoom streams planned for the talks in this semester.
For further information (such as related papers, linked software etc.) and the seminar schedule, please see:
www.wu.ac.at/en/statmath/research/resseminar

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